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Setting Raduis and Arc on Toro sprinkler heads

Hello everyone.
I have volunteered to look after the irrigation system at our lawn bowling club. I have the system running but the heads need adjustment. They are large ones. They have 'Toro Sprinkler Yard' and 'Rotary Gear' on the top plate. I have looked on the internet and they could be 670 Series but I'm not sure. I can't find anywhere how to adjust the start and stop points. We need 90 degrees with accurate start and stop positions.
Where would I find the actual model number of these heads?
Thanks, Glen...